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Thanks! Zacatecas could be either sspp., as it extends from central to SW Mexico, but the main heavily inhabited areas are in the wetter SW. "Mexico occ. Zacatecas" I'd think means 'western Mexico, Zacatecas'.

Any idea who raised it to genus? Avibase cites the AOU 1st ed. checklist having it so by 1886.

Pyrrhuloxia was raised to full genus by Bonaparte himself.
- Bonaparte & Schlegel 1850, Monographie des Loxiens, [here]: "Cardinalis sinuatus qui à la vérité pourrait constituer un genre à part (Pyrrhuloxia?)"; he was obviously still undecided at this point.
- Bonaparte 1853, in the Collections Delattre series of papers [here]: here the taxon is listed as a full genus.